NewValueExpr creates a ValueExpr with value, and sets default field type.

Index key types.

Index key types.

AggregateFuncExpr represents aggregate function expression.

BinaryExpr is for binary operation like `1 + 1`, `1 - 1`, etc.

ByItem represents an item in order by or group by.

CaseExpr is the case expression.

CreateIndexStmt is a statement to create an index.

DropIndexStmt is a statement to drop the index.

ExistsSubqueryExpr is the expression for "exists (select ...)".

ExtractFuncExpr is for function expression.

FuncCallExpr is for function expression.

HavingClause represents having clause.

IsNullExpr is the expression for null check.

LimitClause is the limit clause.

OrderByClause represents order by clause.

ParenthesesExpr is the parentheses expression.

PatternInExpr is the expression for in operator, like "expr in (1, 2, 3)" or "expr in (select c from t)".

SelectElement represents a result field which can be a property from a label, or an expression in select field.

SubqueryExpr represents a subquery.

SubstrFuncExpr is for function expression.

UnaryExpr is the expression for unary operator.

ValueExpr is the simple value expression.

WhenClause is the when clause in Case expression for "when condition then result".

DDLNode represents DDL statement node.

DMLNode represents DML statement node.

ExprNode is a node that can be evaluated.

Node is the basic element of the AST.

StmtNode represents statement node.

Visitor visits a Node.

IndexKeyType is the type for index key.